<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

</body>

</html>
<script>
    let obj = { name: '蔡徐坤', age: 24, hobby: ['唱歌', '跳舞', 'rep'] }
    function copy(obj) {
        let obj2 = Array.isArray(obj) ? [] : {}
        for (var key in obj) {
            if (typeof obj[key] === 'object') {
                obj2[key] = copy(obj[key])
            }
            else {
                obj2[key] = obj[key]
            }
        }
        return obj2
    }
    console.log(obj);
    let x = copy(obj)
    x.hobby.push('打篮球')
    console.log(x);
</script>